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Abstract

A precisely controlled metallic nanomesh was fabricated by using nanosphere lithography to pattern the silver thin film to form hexagonal nanohole arrays with excellent uniformity, high conductivity and good transparency. An Alq3 based OLED, with the silver nanomesh electrode of high ðll factor of 70.2% demonstrated a considerable luminous efðciency of 4.8 cd/A, which is 60.9% higher than the referenced device with ITO anode. The periodical nanohole array not only increased the transparency but also helped extracting surface plasmonic wave in organic layers. By attaching the microlens array to further extract the trapped light in substrate, the extraction efficiency enhancement of device with nanomesh anode was 73.8% higher than 50.2% of the referenced device with ITO anode. And the overall current efficiency of device with nanomesh anode was 87.7% higher than traditional ITO based device.

Figures (6)

SEM images of close-packed PS nanospheres with different etching conditions: (a) RIE power of 60W for 5 minutes (fill-factor: 0.70), (b) RIE power of 60W for 5 minutes and 30W for 3 minutes (fill-factor: 0.58), (c) RIE power of 60W for 5 minutes and 30W for 6 minutes (fill-factor: 0.55), and (d) diameter and fill-factor of PS nanosphere as a function of etching time.